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As omnivorous birds, ducks will eat many different foods, and the best foods to offer ducks include: 1  Cracked corn. 2  Wheat, barley or similar grains. 3  Oats (uncooked; rolled or quick) 4  Rice (cooked or uncooked) 5  Milo seed. 6  Birdseed (any type or mix) 7  Grapes (cut in half or quartered if very large)
Insects such as beetles, flies and dragonflies are tasty treats for Mallard ducks. Mallards also eat mollusks, small fish and fish eggs. On the water's surface, Mallard ducks also feast on frogs, tadpoles, worms and snails. These types of foods provide the protein and fat nutrients a Mallard duck needs in its diet.